two heavy boxes of masses 24.0 kg and 36.0 kg sit on a smooth, frictionless surface. The boxes are in contact, and a force of 60.0 N is applied...

two heavy boxes of masses 24.0 kg and 36.0 kg sit on a smooth, frictionless surface. The boxes are in contact, and a force of 60.0 N is applied horizontally to the smaller box. what is the acceleration of the two boxes?